Fujitsu MHZ2250BJ Manuel d'utilisateur Page 86

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Interface
5.2.1 Communication layers
Each of the layers is outlined below.
Physical layer
Detects, sends, and receives band signals.
Sends serial data to and receives it from the link layer.
Link layer
Negotiates against mutual transfer requests between the host system and
device.
Encodes serial data as 10- or 8-bit data, then converts it into DWORD data.
Inserts auxiliary signals (SOF, CRC, and EOF), deletes auxiliary signals, and
communicates with the transport and physical layers.
Transport layer
Exchanges data in communication with the link layer, and builds the frame
information structure (FIS).
Contains a (Shadow) Block Register.
Reflects the FIS contents to the Block Register.
5-12 C141-E280
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